MVC architecture overview in PHP - Cheat Sheet & Quick Revision

Recall & Review

beginner

What does MVC stand for in software architecture?

MVC stands for Model-View-Controller. It is a design pattern that separates an application into three main parts to organize code and responsibilities.

beginner

What is the role of the Model in MVC?

The Model manages the data and business logic. It handles data storage, retrieval, and rules, like a brain that knows how data works.

beginner

What does the View do in MVC architecture?

The View is responsible for showing data to the user. It displays the user interface and presents information from the Model in a readable way.

beginner

Explain the Controller's function in MVC.

The Controller acts like a traffic cop. It receives user input, decides what to do, updates the Model, and tells the View what to display.

intermediate

Why is MVC architecture useful in PHP applications?

MVC helps keep code organized and easier to maintain. It separates concerns so developers can work on data, interface, and input separately without mixing everything.

In MVC, which component handles user input?

A Controller

B Model

C View

D Database

The Controller receives and processes user input, then updates the Model or View accordingly.

Which MVC part is responsible for displaying information to the user?

A Model

B Router

C Controller

D View

The View shows data and user interface elements to the user.

What does the Model in MVC mainly manage?

A Data and business logic

B User input

C User interface

D Network requests

The Model handles data storage, retrieval, and business rules.

Why is MVC architecture helpful in programming?

A It removes the need for a database

B It mixes all code in one place

C It separates concerns for better organization

D It makes programs run faster

MVC separates code into parts, making it easier to manage and update.

In PHP MVC, which part would you update to change how data is saved?

A View

B Model

C CSS

D Controller

The Model controls how data is saved and managed.

Describe the three parts of MVC architecture and their roles.

Think of MVC as a team where each member has a clear job.

Explain why separating code into Model, View, and Controller is helpful in PHP projects.

Imagine trying to fix a problem when all code is mixed together versus when it is neatly divided.

Practice

1. In the MVC architecture, which component is responsible for handling user input and updating the model?

easy

A. Controller

B. Model

C. View

D. Database

Solution

1. Step 1: Understand MVC roles

   The Model manages data, the View displays data, and the Controller handles user input.

2. Step 2: Identify the component for user input

   The Controller receives user actions and updates the Model accordingly.

3. Final Answer:

   Controller -> Option A

4. Quick Check:

   Controller handles input [OK]

Hint: Controller connects user actions to data changes [OK]

Common Mistakes:

• Confusing Model with Controller
• Thinking View handles input
• Assuming Database is part of MVC

2. Which of the following is the correct way to describe the role of the Model in MVC?

easy

A. It processes user input and updates views.

B. It manages the data and business logic.

C. It displays data to the user.

D. It handles routing and URLs.

Solution

1. Step 1: Recall Model's responsibility

   The Model stores and manages data and business rules.

2. Step 2: Match description to Model

   Only It manages the data and business logic. correctly states that the Model manages data and logic.

3. Final Answer:

   It manages the data and business logic. -> Option B

4. Quick Check:

   Model manages data and logic [OK]

Hint: Model is about data and rules, not display or input [OK]

Common Mistakes:

• Mixing up Model and View roles
• Thinking Controller manages data
• Confusing routing with Model

3. Given this PHP MVC snippet:

<?php
class Controller {
  public function show() {
    $data = Model::getData();
    View::render($data);
  }
}

class Model {
  public static function getData() {
    return ['name' => 'Alice'];
  }
}

class View {
  public static function render($data) {
    echo 'Hello, ' . $data['name'];
  }
}

$controller = new Controller();
$controller->show();
?>

What is the output when this code runs?

medium

A. Hello, name

B. Array

C. Hello, Alice

D. Error: Undefined index

Solution

1. Step 1: Trace data flow in code

   The Controller calls Model::getData(), which returns ['name' => 'Alice'].

2. Step 2: Check View rendering

   View::render() echoes 'Hello, ' plus the value of $data['name'], which is 'Alice'.

3. Final Answer:

   Hello, Alice -> Option C

4. Quick Check:

   Output = 'Hello, Alice' [OK]

Hint: Follow data from Model to View for output [OK]

Common Mistakes:

• Printing the array directly
• Using wrong array key
• Confusing static method calls

4. Identify the error in this MVC PHP code snippet:

<?php
class Controller {
  public function display() {
    $data = Model::fetchData();
    View::show($data);
  }
}

class Model {
  public static function getData() {
    return ['age' => 30];
  }
}

class View {
  public static function show($data) {
    echo 'Age: ' . $data['age'];
  }
}

$controller = new Controller();
$controller->display();
?>

medium

A. Model::fetchData() method does not exist

B. View::show() method is missing

C. Controller class is not instantiated

D. Array key 'age' is incorrect

Solution

1. Step 1: Check method calls in Controller

   Controller calls Model::fetchData(), but Model only has getData() method.

2. Step 2: Verify Model methods

   Model::fetchData() does not exist, causing a fatal error.

3. Final Answer:

   Model::fetchData() method does not exist -> Option A

4. Quick Check:

   Model::fetchData() method does not exist [OK]

Hint: Match method names exactly between classes [OK]

Common Mistakes:

• Assuming method names are interchangeable
• Ignoring case sensitivity
• Overlooking missing methods

5. You want to add a feature in your PHP MVC app to display a list of users. Which MVC components should you update and how?

hard

A. Update Model to display list, View to fetch users, Controller to store data

B. Update View to fetch users, Controller to display list, Model to handle input

C. Update Controller to fetch users, Model to display list, View to handle input

D. Update Model to fetch users, Controller to pass data, View to display list

Solution

1. Step 1: Assign responsibilities per MVC

   The Model fetches data, Controller processes logic, View shows output.

2. Step 2: Map feature to components

   Model fetches users, Controller gets data and sends to View, View displays user list.

3. Final Answer:

   Update Model to fetch users, Controller to pass data, View to display list -> Option D

4. Quick Check:

   Model=data, Controller=logic, View=display [OK]

Hint: Model gets data, Controller links, View shows it [OK]

Common Mistakes:

• Letting View fetch data directly
• Making Controller handle display
• Confusing roles of MVC parts